Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92e08bb09971511…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 16:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e268cbd66946ed2083e8c962cdbb271f SHA-1: 1e9cac626ac76774a7f8b26a81532dccb36940d4 SHA-256: f92e08bb09971511a5e86b48ed9fc66d71ea890e611c0a016e48ebd73313dd82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa2056466---tabotowa.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/fecgt2rga82up97duafq4odbe3/9487927295.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/idne58nkp896bpvb2kqv8s2r0e/davobewubap.pdf
    • https://securityguardsupply.com/php/uploads/file/47199951886.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/26dba367283a20af6dd4eed124780b1d/90213525932.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad70b1aed0---61624928731.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44ab6e873---vujovagimolurobafubu.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf05f7b52b---33868703358.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607324f286a2f---80058713382.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ksjnme89mdvedtfs8o6ob3ph97/demumewazotulofagizej.pdf
    • http://altinay-law.com/images/file/90110484597.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd9896f7a---memedimomotimafu.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3fba1a1c---wibovofeginuw.pdf
    • https://bushregenerators.biz/userfiles/files/kuborexezedamidoka.pdf
    • https://mariellatriolo.it/public/file/52362479436.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099ee3faec8a---9682983307.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jfv3cvl2tj030bddb4lspjbdr2/jepapojitejorepawotaf.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31684387cc---96900755750.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/80ef9519d684f673f7eeff82f498f01b/2749301017.pdf
    • http://baigeleather.com/userfiles/file/53760384946.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa68ca909df---50762970386.pdf
    • http://meble-tk.pl/userfiles/file/70807231046.pdf
    • https://ukmalayalamnews.com/userfiles/file/5746343480.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078c54387692---wefevonewiniviter.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a5c68b9a76ea990da33690215b6bbe5b/mexikowaki.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885b5a49c88---64611384386.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=guardian+tales+codes
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin
5b2f87be61139a91788ecfc5e2ada9aa5311511cdf8adeaaa4f8b7119a97db42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 27700 bytes
font_01_sfnt_off00012c66.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C66 16792 bytes
font_02_sfnt_off0001447d.bin
47da53489822210bab9a0f480d15343c175b0905142a65caa8e485f811d923f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1447D 10500 bytes